“As of November 2009, Belgium, Germany, Italy, the Netherlands and Turkey are still hosting U.S. nuclear weapons as part of NATO's nuclear sharing policy. Canada hosted weapons until 1984, and Greece until 2001. The United Kingdom also received U.S. tactical nuclear weapons such as nuclear artillery and Lance missiles until 1992, despite the UK being a nuclear weapons state in its own right; these were mainly deployed in Germany. In peace time, the nuclear weapons stored in non-nuclear countries are guarded by U.S. soldiers; the codes required for detonating them are under American control.”

http://en.wikipedia.org/wiki/Nuclear_sharing

Also, let’s not forget the US has 2,150 active warheads in total; the vast majority of those are located on American soil.